<template>
    <div class="nav-bar" :class="{'is_fiexed':isFixed}">
        <div class="container">
            <div class="pro-title">
                {{title}}
            </div>
            <div class="pro-params">
                <a href="">概述</a><span>|</span>
                <a href="">参数</a><span>|</span>
                <a href="">用户评价</a>
                <slot name="buy"></slot>
            </div>
        </div>
    </div>    
</template>
<script>
    export default {
        name:'nav-bar',
        props:{
            title:String
        },
        data(){
            return{
                isFixed:false
            }
        },
        mounted(){
            window.addEventListener('scroll',this.initHeight)
        },
        methods:{
            initHeight(){
                let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
                this.isFixed = scrollTop > 150?true:false;
            }
        },
        destroyed(){
            window.removeEventListener('scroll',this.initHeight,false);
        }
    }
</script>
<style lang="scss">
@import './../assets/scss/config.scss';
@import './../assets/scss/mixin.scss';
   .nav-bar{
       height: 70px;
       line-height: 70px;
       border-top: 1px solid $colorH;
       background-color: $colorG;
       z-index: 10;
       &.is_fiexed{
           position: fixed;
           top: 0;
           width: 100%;
            box-shadow: 0 5px 5p #cccccc;

       }
       .container{
           @include flex();
           .pro-title{
               font-size: $fontH;
               color: $colorB;
               font-weight: bold;
           }
           .pro-params{
               font-size: $fontJ;
               color: $colorC;
               span{
                   margin: 0 10px;
               }
               a{
                   color: $colorC;
               }
           }
       }
   };
   
</style>

